Variegated amphissa (Amphissa versicolor) ~ This snail is common among algae and under rocks; it grows to a length of 17 mm.  It has axial ridges that run at a slant and crossed by fine, close-set spiral cords.  The color varies including white, gray, yellow and brown.  The snail can be mottled or have dark spiral lines.  A. versicolor is the more common species in parts of California. These snails are scavengers. the eggs are about 2 mm in diameter and are laid in small helmet-shaped capsules.